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[Qemu-devel] [PATCH 1/2] Add no-op aio emulation stub
From: |
Alexander Graf |
Subject: |
[Qemu-devel] [PATCH 1/2] Add no-op aio emulation stub |
Date: |
Thu, 13 May 2010 01:36:27 +0200 |
We need to be able to do nothing in AIO fashion. Since I suspect this
could be useful for more cases than the non flushing, I figured I'd
create a new function that does everything AIO-like, but doesn't do
anything.
Signed-off-by: Alexander Graf <address@hidden>
---
v1 -> v2:
- remove stray define
- make aio noop handler static
- remove header define
---
block.c | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/block.c b/block.c
index 48305b7..00e9b6b 100644
--- a/block.c
+++ b/block.c
@@ -2196,6 +2196,24 @@ static BlockDriverAIOCB
*bdrv_aio_flush_em(BlockDriverState *bs,
return &acb->common;
}
+static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
+ BlockDriverCompletionFunc *cb, void *opaque)
+{
+ BlockDriverAIOCBSync *acb;
+
+ acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
+ acb->is_write = 1; /* don't bounce in the completion hadler */
+ acb->qiov = NULL;
+ acb->bounce = NULL;
+ acb->ret = 0;
+
+ if (!acb->bh)
+ acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
+
+ qemu_bh_schedule(acb->bh);
+ return &acb->common;
+}
+
/**************************************************************/
/* sync block device emulation */
--
1.6.0.2